Fróðskaparrit - 01.01.2001, Side 123

Fróðskaparrit - 01.01.2001, Side 123
127 Breeding distribution and numbers of wren (Troglodytes troglodytes) in the Faroe Islands s Utbreiðsla og tal av Músabróður (Troglodytes troglodytes) í Føroyum Sven-Axel Bengtson Museum of Zoology, University of Lund, Helgonav. 3, SE-223 62 Lund, Sweden. Phone: +46 46 222 8457; Fax: +46 46 222 4541; e-mail: zoomus@zool.lu.se Úrtak Føroyski músabróðurin (Troglodytes t. borealis) er støðufuglur og eitt egið underslag. Hann er vanligur um allar Føroyar. Grundað á kanningar gjøgnum tey sein- astu 20 árini verður mett, at stovnurin telur millum 650 og 800 pør, kanska fleiri. Umleið 28% eiga á bygdum økjum og í bønum, 49 % í haganum (einameist niðri í bakkanum), og 23% í bjørgunum. Bert heilt fá pør eru halda til í plantasjum. A smáum oyggjum eru lutfalsliga fleiri pør. Møguligar orsøkir til hetta (t.d. sjófuglur, ketta, grótgarðar o.s.fr.) verða umrøddar. Broytingar í stovninum millum ár kunnu vera 15-30%, men ikki síggjast langtíðar broytingar í tølunum. Líkt er tó til, at flyting hevur verið burtur frá bygdum og út í haga og fuglabjørg. Abstract The sedentary, endemic subspecies, of wren (Troglo- dytes t. borealis) is common and widespread all over the Faroe Islands. The total breeding population was esti- mated, on the basis of field-data collected during the past 20 years, as being between about 600 and 850 pairs, and probably more. About 28% are found at settlements and on cultivated land surrounding them (infields), 49% in the outfield areas (mostly near the shores), and 23% on sea cliffs. Few pairs are to be found in plantations. Small islands have relative many breeding pairs; possi- ble reasons (e.g. presence of seabird colonies, cats, stone walls etc.) are discussed. Annual fluctuations in the or- der of 15-30% occur but no long-term significant changes in numbers are discemible, though a possible shift from breeding at settlements to outfield areas and sea cliffs is suggested. Introduction The sedentary Faroese population of wren (Troglodytes t. borealis), recognized as a subspecies endemic to the islands, is wide- ly distributed and common in the Faroe Is- lands, as stated by early as well as recent authors (e.g. Landt, 1800; Holm, 1848; Miiller, 1862; Feilden, 1872; Salomonsen 1934; Williamson 1948; Joensen 1966; Bengtson and Bloch, 1983). The same sources also describe, in general terms, habitats and habits of the wren in the is- lands; e.g. that it is common in many of the villages (especially outside of the breeding season) and how it is often seen sneaking into bams, drying-houses and other build- ings in search for food and shelter (hence its Faroese name músabródir i.e. ”the brother of the mouse”). It is also to be found on coastal and inland cliffs, among rocks and in boulder-fields, in gullies and ravines, and along small streams. Already Landt (1800) exhibited ecological reason- ing by claiming that the wren was more abundant on the northem islands and in Fróðskaparrit 49. bók 2001: 127-139
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